A Cast iron shaft transmits 30kW at 300 rpm. It carries a central load of 1000N and is simply supported between the bearings 3 meters apart. Determine the size of the shaft, if the allowable shear stress is 50MPa and the maximum tensile or compressive stress is not to exceed 60MPa.

A Cast iron shaft transmits 30kW at 300 rpm. It carries a central load of 1000N and is simply supported between the bearings 3 meters apart. Determine the size of the shaft, if the allowable shear stress is 50MPa and the maximum tensile or compressive stress is not to exceed 60MPa.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Concept explainers

Combined Loading

Any functioning component, such as machine parts, structural members, pressure vessels, and so on, are all under the influence of more than one force. When anybody is under the influence of more than one force such as shear forces, bending moments, axial forces, torsion, and so on, then such body is said to be under combined loading. A very practical example of combined loading is the crankshaft of an internal combustion engine (IC engine). The crankshaft of the IC engine is under high rpm, which is caused due to the torsional forces. Due to the presence of piston, counterbalances, and internal imbalances, the crankshaft experiences lateral forces and due to the rise in temperature, the crankshaft undergoes thermal expansion, which pulls the crankshaft along the axial direction and lateral direction. The presence of unbalanced loads along the periphery of the crankshaft also induces a bending moment.

Question

2. A Cast iron shaft transmits 30kW at 300 rpm. It carries a central load of 1000N and is simply supported
between the bearings 3 meters apart. Determine the size of the shaft, if the allowable shear stress is 50MPa
and the maximum tensile or compressive stress is not to exceed 60MPa.

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